<?xml version="1.0" encoding="utf-8"?>
<Entity parent="template_structure_economic_storehouse_vegan_store">
<Identity>
<Civ>gaia</Civ>
<SpecificName>vegan store</SpecificName>
</Identity>
<VisualActor>
<Actor>structures/gaia/farmstead.xml</Actor>
</VisualActor>
</Entity>
for adding the storehouses supported by realism mod you need to update the builder template (if you downloaded the repo before this post) and then, for every civ folder you add xml files like this (for now the available templates are for vegan, meat, water, wood, stone and metal).
builder.xml